Classify the input using one of these labels: neutral, positive, and negative. @AmericanAir jet slides off icy taxiway at @dfwairport 

STORY: http://t.co/4pONJ3jidE http://t.co/3DCWerZ1kr
system
Classify the input using one of these labels: neutral, positive, and negative. @AmericanAir jet slides off icy taxiway at @dfwairport 

STORY: http://t.co/4pONJ3jidE http://t.co/3DCWerZ1kr
user
neutral
assistant
system
Classify the input using one of these labels: neutral, positive, and negative. @AmericanAir jet slides off icy taxiway at @dfwairport 

STORY: http://t.co/4pONJ3jidE http://t.co/3DCWerZ1kr
user
negative
assistant